About the VoLTE/VoWIFI, is this confirmed? Cause I'm facing the same issue. I can't even activate RCS features in the stock messages app. Anyway, to activate VoLTE/VoWIFI, I need to call them? I'm using Smart by the way.You need to call your network provider to ask them to allow you to use VoLTE or VoWIFI. It's not activated by default. For globe what I did was just use the globeone app to request for activation. But currently only postpaid works with VoLTE and VoWIFi no prepaid.
For activating 4g+ you need to do the guide on the other thread to activate CA. Basically 4g+ is CA. CA = Carrier Aggregation.